Improvement in locomotive smoke-stacks



K. J. DUGGAN.

Improvement in Locomotive Smoke-Stacks.

No. 129,272, Patentedluiymmsm.

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UNITED .STATES PATENT OFFICE.

KEYRAN J. DUGGAN, OF MONTGOMERY, ALABAMA.

IMPROVEMENT IN LOCOMOTIVE SMOKE-STACKS.

Specification forming part of Letters Patent No. 129,272, dated July 1d,1872.

My improved construction is calculated tof greatlyeconomize the cost andto dispense with inside pipes, which greatly interfere with the removalof the stack for cleaning and repairs.

In the accompanying drawing, Figure l is partly a side elevation andpartly a sectional elevation of my improved stack. Fig. 2 is a sideelevation of the top section. Fig. 3 is a plan of the top; and Fig. 4 isa top view of the middle section and the cone, the top section beingremoved.

Similar letters` of reference indicate corresponding parts.

A is the bottom cylindrical section, which connects wit-h the cast-ironsaddle, iitted on the top of the boiler in the usual way. B is themiddle section, in the form of an inverted frustum of a conc. These twosections are permanently riveted together. C is `the top section, alsoin the form of a frustum of a cone. These two sections are connected attheir bases by the two angle-iron rings D E, the horizontalA flanges ofwhich are bolted together by about six, more or less, bolts, F, and thesaid sections are riveted to their respective rings, the vertical ornearly vertical lan ges of which iit snugly inside the sections. G isthe cone, which I secure to the ring D by bars or braces H and bolts I,so that it can be taken oft' readily when required. This cone is aboutthe same diameter as that of the wire-gauze spark-ar rester K at thetop, but, being arranged at the largest diameter of the stack, isdesigned to aii'ord an annular space for the ascent of the smoke ofabout ten inches in width in stacks of large size 5 but it may bevaried, as circumstances may require. The wire-gauze sparkarrester K isriveted down upon the horizontal flange of the angle-iron ring E, withthe sections M of rings and cross-bar N above. The said ring is iittedinside ofthe top of the upper section C, and another iiaring ring, O,for strengthening the top, is fastened, together with it, to the saidtop section by rivets. P is the damper, fitted in the open space betweenthe cross-bars N. It consists of a frame with wire-nettin g stretchedupon it, and is mounted on pivots at the center of each end, on which itis balanced, and opens up and down. One of the pivots is provided with acrank, Q, by which a rod or cord extending to the cab may be used forturning it. This crank is also prov vided with a curved slotted arm, R,which works on a bolt with a nut, by which said damper may be readilyopened or closed.

Having thus described my invention, -I claim as new and desire to secureby Letters Patent- The combination of the concave-convex plates Gr andspark-arrester K with a smokestack, BO, and angle-irons D E, constructedand arranged as and for the purpose described.

KEYRAN JAMES DUGGAN.

